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This is the GIS module to go with the standard DICE program
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$title        DICE-GIS-2016 May 2017 part1
* GIS parameters
parameters
    meltmult     Multiplier times melt rate    /1/
    volzero      Initial vol                   /99.9/
    tzero        Initial temp                  /1/
    tmaxtemp     Period of geoengineering      /50000/
    tgeo         Geoengineering temp           /.1/
    avoldot0     Base vol temp coef                / -0.0053  /
    avoldot      Equil vol temp coef
    cgisdam      Damage from full melt fraction output  /.0002/
    tmaxa        Global temp at which minimum volume    /3.4/
    slrgis       Sea level rise from GIS melt meters    /7/
    expvol       Exponent on voldot                     /.2/
** omitted
*    gisvolmin    Minimum volume                 /.01/
*    ifirrev      If irreversible                /0/
*    gisvollast   Terminal volume                /.010/

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PARAMETERS
  tatmexo(t) exog temp;
*  avoldot=avoldot*meltmult;
  tatmexo(t) = tzero$(t.val le tmaxtemp)+tgeo$(t.val gt (tmaxtemp));

